What does --with-thunderbird option do in configure?

[Abbas Faiq <afaiq aol com>]

I was under the impression that beagle did not search Thunderbird 
email/address book. Then I noticed the following as one of the configure 
options:

--with-mozilla[=mozilla|firefox|thunderbird]
                         Whether to use mozilla, firefox or thunderbird

so I went ahead and used "--with-firefox --with-thunderbird" as options 
for ./autogen.  No errors were thrown but doesn't look as if my 
thunderbird emails were indexed? So what does --with-thunderbird 
configure option do?

Also, how do I get Best to put the right icons on the search results - 
Word icon for .doc, Excel for .xls, Star office/Open Office for .sxw etc?

Regards

Abbas